The conference was also attended by a delegation from Croatia.
Representatives of Japan, Poland and Romania refused to sign an agreement adopted outside international institutions and without leading arms producers such as the United States, Russia, Israel and China.
The declaration envisages a ban on the use, production, transfer and storage of cluster bombs which cause unacceptable damage to civilians, AFP reported.
The declaration calls on its signatories to implement measures on the national level before the entry into force of the agreement. Norway has already done this, and Austria declared a moratorium at the start of the conference.
The document is not binding. It is a statement of political will, said Steve Goose of the Human Rights Watch.
The conference was not attended by representatives of the USA, China and Russia which have also refused to join a ban on land mines.
Representatives of Australia, Israel, India and Pakistan did not attend either, because those countries claim that this type of weapons should be discussed by international institutions such as the UN and the Convention on Conventional Weapons.